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Colour

#688CAD

  • #688CAD
  • Blue
  • Dark
  • Nearest: Light slate grey

#688CAD is a blue with RGB values 104, 140, 173 and HSL 209°, 30%, 54%. It is a dark colour, so black text on it reaches 5.9:1 contrast (AA for normal text). The nearest named colour is Light slate grey.

Colour values

#688CAD#688CAD
HEX#688CAD
RGBrgb(104, 140, 173)
RGB (0–1)0.4078, 0.549, 0.6784
RGB percentages40.8%, 54.9%, 67.8%
HSLhsl(208.7, 29.6%, 54.3%)
HSV / HSBhsv(208.7, 39.9%, 67.8%)
CMYK39.9%, 19.1%, 0%, 32.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,851,757
CSS custom property--colour: #688CAD;

Brightness & contrast

Relative luminance0.24716WCAG 2.x, 0 is black and 1 is white
Perceived brightness134.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.94:1
Contrast with white3.53:1WCAG normal text: Fail
Contrast with black5.94:1WCAG normal text: AA
Greyscale equivalent#878787
Inverted#977352

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7F8CAFno red cones; affects about 1% of men; ΔE 7.6 from the original
Deuteranopia#7685ACno green cones; the most common form, about 1% of men; ΔE 8 from the original
Tritanopia#4F9497no blue cones; rare, and affects men and women equally; ΔE 21.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.53:1WCAG large text: AA
Contrast with black, large text5.94:1WCAG large text: AAA

Named colours

Light slate grey · ΔE 10.4Slate grey · ΔE 11.6Steel blue · ΔE 11.7Cadetblue · ΔE 21.5Gray · ΔE 21.9Light steelblue · ΔE 22.7
Nearest named CSS colourLight slate grey (#778899)ΔE 10.4, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#AD8968
Analogous#68ADAB, #686AAD
Triadic#AD688C, #8CAD68
Split complementary#AD686A, #ADAB68
Tetradic#AB68AD, #AD8968, #6AAD68

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#ECF1F5
Lighter +30%#CBD8E3
Lighter +20%#AABED1
Lighter +10%#89A5BF
Darker −10%#507292
Darker −20%#3E5971
Darker −30%#2C3F50
Darker −40%#1A252F
More saturated +25%#4B8DCA
Less saturated −25%#858B90

Channel breakdown

R104
G140
B173
Red104 (40.8%)
Green140 (54.9%)
Blue173 (67.8%)
Hue208.7°
Saturation (HSL)29.61%
Lightness54.31%
Dominant channelBlue
Hex per channelR 68 · G 8C · B AD

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Every value on this page was computed from “688cad” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.